Changes reactions to not include the entire thread as e-tags.

[vitorpamplona]

Current guidance recommends including all e tags and p tags, but no other tags, from the liked post in the reaction event. I believe this is a relic of the past and should be deprecated.

There is no need to index the entire thread in every single reaction. The indexing burden in popular threads is real. I would argue reactions should only point to the note receiving the reaction and nothing else.

Reasons for the change:

1. Indexing burden: Indexing entire threads for every single reaction has quadratic costs on the thread's popularity.
2. Data consumption: requesting reactions to posts in the feed downloads all reactions to all replies in that thread, which is not necessary.
3. No consistency: We now use NIP-10 markers instead of positional e tags for the entire thread. This means that some reactions include the e tags for the entire thread while others only include root and reply, and others only include the reply without the marker. Since we also have mention and q tags, mentions are added to the reaction's tag array while q tags are not. Conclusion: there is no consistency for reaction counters that are not the reacted event.
4. No addresses: The recommendation was from before a tags existed, so a tags are not even included.
5. It's unnecessary: No one reassembles a thread from a reaction event, so there is really no need to have all the tags there.
6. Zaps and replies don't follow the same rule: We don't include the entire thread on zaps, replies, and quotes. Not even on reports. This only exists on reactions.

[fabianfabian]

agree